Wideband FDTD scattering from dispersive targets

A technique for including the frequency dependence of constitutive parameters in FDTD (finite-difference time-domain) computations has been developed. The technique involves computation of the required time-domain convolution using a recursive method that requires only one additional storage location per affected field component. Results for wideband scattering from three-dimensional targets containing dispersive materials have been obtained. These results indicate the accuracy which can be obtained using this approach, and the potentially large savings in computational resources when wideband scattering results from targets which include frequency-dependent materials are required.<>